Display screen or portion thereof with a graphical user interface



FIG. 1 is a front view of a display screen of portion thereof with a graphical user interface showing the present design;

FIG. 2 is a front view of another embodiment of a display screen or portion thereof with a graphical user interface showing the present design;

FIG. 3 is a front view of another embodiment of a display screen or portion thereof with a graphical user interface showing the present design;

FIG. 4 is a front view of another embodiment of a display screen or portion thereof with a graphical user interface showing the present design;

FIG. 5 is a front view of another embodiment of a display screen or portion thereof with a graphical user interface showing the present design;

FIG. 6 is a front view of another embodiment of a display screen or portion thereof with a graphical user interface showing the present design; and,

FIG. 7 is a front view of another embodiment of a display screen or portion thereof with a graphical user interface showing the present design.

The broken line showing of a display screen or portion thereof with a graphical user interface is included for the purpose of showing portions of the article which form no part of the claim. 

CLAIM The ornamental appearance of a display screen or portion thereof with a graphical user interface, as shown and described. 